Photographic-plate holder.



No. 891,304. PATENTED JUNE 23, 1908.

G. VON UNRUH. PHOTOGRAPHIG PLATE HOLDER.

APPLICATION FILED AUG. 15, 1906.

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UNITED STATES PATENT OFFICE.

CARL VON UNRUH, OF DETMOLD, GERMANY.

PHOTOGRAPHIC-PLATE HOLDER.

To all whom it may concern:

Be it known that I, CARL VON UNRUH, a subject of the German Emperor, and resident of Detmold, Germany, have invented certain new and useful Improvements in Photographic-Plate Holders, of which the following is a specification.

Holders for exposed photographic plates and the like, which consist of a frame furnished with a handle and having one side open and three sides provided with grooves or hooks are already known. According to the present invention one groove is closed on the side adjoining the open side, so that the plate can only slide out when the frame is inclined towards the hook side and the open side. Accordingly in manipulating the plate it is only necessary. to hold the side of the frame with the closed groove lower in order to prevent the plate from falling out unintentionally when the open side is placed obliquely. The device serves for holding the plate during all the operations, for example, the developing, fixing, intensifying or reducing of the plate. A holder of this kind is illustrated in the accompanying drawing.

Figure 1 is a plan. through A. B. in Fig. 1. through C. D. in Fig. 1. Fig. 4 is a side elevation. Fig. 5 is a back view and Figs. 6 and 7 are plans or front views of modified forms of the present invention.

Fig. 2 is a section Fig. 3 1s a section Specification of Letters Patent;

Application filed August 15, 1906.

Similar letters refer to similar parts throughout the several views.

The frame a forming the holder and made of suitable material such as celluloid, vulcanite, metal, papier mach, enameled iron or the like, is furnished with grooves b and c opening inwards along two adjacent sides, and on the third side with a hook like part d-, whereas the fourth side of the frame has neither grooves nor any such hook like devices. The width of the grooves is such that the plate is not clamped Patented June 23, 1908.

Serial No. 330,735.

The introduction of the plate into the holder is effected by placing the plate in the hook d so that it rests therein and on the lower end of the handle g-. As a matter of course instead of the hook the whole side of the frame may be turned up. Thereupon the frame is inclined so that the plate slides in the frame up to the groove blying opposite the hook -dor the groove which replaces the hook. The plate is now prevented from falling out during the operations carried on in the baths as well as when trans ferred from one bath to another, as long as the side of the frame with the groove -b is held lower than the opposite side of the frame. hen the treatment of the plate is ended, the plate can be slid into the hook or into the groove that may replace the hook by holding the handled side lower, and can be slid out on the free side of the frame by further tilting the frame around a transverse axis. With a little practice the plate can be easily delivered and without damage to the film in any desired place, for example into the holder intended for the fixing or the plate drying frame.

In case of necessity the holder a. may be provided with several handles g, on one or different sides (Fig. 7). The handle may also be connected with the holder so as to be interchangeable and be placed on dif ferent sides of the holder as desired. (Figs. 5 and 6.) For example in the case of upright or vertical developing trays, it is advisable to arrange the handle at an angle to the frame. (Fig. 5.) If necessary, the handle may be made of flexible material or be provided with a hinge so that it can be easily turned over. (Fig. .6.)

In order to distinguish the holder for placing the plate in the developer from those employed for putting them into the fixing bath the holders are colored differently or pro vided with tangible distinguishing marks. For example the developing holders may be colored red and the fixing holders black 01' have differently shaped handles and be provided with distinguishing holes or with studs. For instance, holders employed for putting the ex osed plate or the like into the devel oping iquid may have handles without holes whereas the handles employed in connection with the fixing bath may have one or more circular holes drilled in them. (Fig. 1.) Ifthe photographer employs liquid for intensifying the plates, it is advisable that the handles of the holders should have cruciform holes drilled in them, (Fig. 6) in order to indicate that the fluid contains poison. The handle for the reducing bath may, on. the other hand, have a hole in the form of a rhombus. (Fig. 5.)

What 1 claim as my invention. and desire to secure by United. States Letters Patent is:

1. A holder for photographic plates and the like, employed in the treatment of the plates in the operations of developing, fixing, intensifying, reducing and the like, having a frame, with a handle, said frame being open on one side and provided on the other sides with grooves, one groove being closed on the side lying against the open side 01" the frame and thereby adapted to let the plate slide out only When the frame is inclined towards the open side, substantially as and for the purpose set forth.

2, A holder for handling photographic plates in the operations of developing, fixing and the like, comprising a frame, a handle on one side thereof, said frame having a groove on the edge opposite the handle, said groove being closed at one end and the frame at the opposite enr'l edge having a groove and a projeetion on the frame on the same side as the handle.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

, CARL VON U N RU ll.

Witnesses:

HENRY J. FULLER, lJEONORE lirrscn. 

